I'd be shy about heavier valve springs, lest you should wipe out the cam lobe. Instead, try a fresh set of springs and use two shims instead on one. Stuff like that is pennies on Taobao.
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Weldangrind
"I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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